After serving as a US marine, this colossus of a man raced in seven grand prix when the Indianapolis 500 was a part of the Formula One championship. Linden had shown huge amounts of skill as a sprint and midget racer and finished in the top six at three of the Indy 500s he competed in. His career ended when he was left brain-damaged after a shard of metal pierced his helmet during a race in 1957. He was confined to a wheelchair but learned to walk again before his death.